US20160282154A1 - Rotational speed sensor which is installed in a mechanically overdetermined manner with an elastic injection-moulded encapsulation - Google Patents
Rotational speed sensor which is installed in a mechanically overdetermined manner with an elastic injection-moulded encapsulation Download PDFInfo
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- US20160282154A1 US20160282154A1 US15/034,631 US201415034631A US2016282154A1 US 20160282154 A1 US20160282154 A1 US 20160282154A1 US 201415034631 A US201415034631 A US 201415034631A US 2016282154 A1 US2016282154 A1 US 2016282154A1
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- sensor
- housing
- data line
- measurement pickup
- installation housing
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- 238000005538 encapsulation Methods 0.000 title 1
- 238000009434 installation Methods 0.000 claims abstract description 39
- 239000000463 material Substances 0.000 claims abstract description 14
- 230000001419 dependent effect Effects 0.000 claims abstract description 10
- 238000005259 measurement Methods 0.000 claims description 49
- 238000005452 bending Methods 0.000 claims description 15
- 229920001971 elastomer Polymers 0.000 claims description 5
- 239000000806 elastomer Substances 0.000 claims description 5
- 239000003822 epoxy resin Substances 0.000 claims description 3
- 229920000647 polyepoxide Polymers 0.000 claims description 3
- 229920003002 synthetic resin Polymers 0.000 claims description 2
- 239000000057 synthetic resin Substances 0.000 claims description 2
- 238000011161 development Methods 0.000 description 7
- 239000000725 suspension Substances 0.000 description 7
- 230000001133 acceleration Effects 0.000 description 4
- 238000001746 injection moulding Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000012815 thermoplastic material Substances 0.000 description 2
- 239000004952 Polyamide Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 229920002725 thermoplastic elastomer Polymers 0.000 description 1
- 238000001721 transfer moulding Methods 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D11/00—Component parts of measuring arrangements not specially adapted for a specific variable
- G01D11/24—Housings ; Casings for instruments
- G01D11/245—Housings for sensors
Definitions
- the invention relates to a sensor for outputting a sensor signal which is dependent on a variable which is to be measured, and to a vehicle comprising the sensor.
- WO 2010/037 810 A1 which is incorporated by reference discloses a sensor for outputting a sensor signal which is dependent on a variable which is to be measured.
- the sensor comprises a measurement pickup which is electrically connected to a data line at a connection point and is designed to feed the sensor signal which is dependent on the variable which is to be measured into the data line, so that the sensor signal can be output via the data line.
- an installation housing which houses the measurement pickup and the data line at least at a connection point can be formed within the scope of a plastic injection-molding process, known as “transfer molding”
- An aspect of the invention aims to improve the known sensor.
- a sensor for outputting a sensor signal which is dependent on a variable which is to be measured comprises a measurement pickup which is electrically connected to a data line at a connection point, is housed in a measurement pickup housing and is designed to feed the sensor signal which is dependent on the variable which is to be measured into the data line, so that the sensor signal can be output via the data line, an installation housing which houses the measurement pickup housing and the data line at least at a connection point and is produced from a flexible material, and a fastening element, which is fixedly connected to the installation housing, for fastening the installation housing to a sensor receptacle, wherein the measurement pickup housing and the fastening element are arranged on two opposite sides of the installation housing.
- the flexible material can be a material with a specific modulus of elasticity.
- the flexibility of the material can also be prespecified by means of a compression set. This is the remaining deformation of the material which remains after deformation with a specific loading over a specific period of time and at a prespecified temperature.
- the test method used can be, for example, ASTM D395.
- the specified sensor is based on the consideration that the sensor has to be fastened to such a rigid installation housing with a predetermined installation tolerance in relation to a wheel bearing in the axle body that the measurement pickup housing does not overlap with the wheel bearing and therefore mechanical stresses are applied to the installation housing, these mechanical stresses then acting on the measurement pickup.
- Mechanical stresses of this kind can be produced, for example, by temperature fluctuations in the other components and subject the installation housing to changes in load which can reach a number of up to two million over the service life of the housing.
- an air gap between the measurement pickup and a transmitter element is increased owing to the installation tolerance, this however increasing the tolerance range of the sensor signal and restricting a reading range of the measurement pickup at the same time.
- the specified sensor starts with the consideration that the measurement pickup housing itself is generally produced from a rigid material.
- This rigid material protects the measurement pickup against the abovementioned mechanical loads. Therefore, the installation housing can be produced from a flexible material which absorbs all mechanical loads which may occur owing to the installed state of the specified sensor, for example in a vehicle, and keeps said mechanical loads away from the measurement pickup housing and therefore from the measurement pickup. Therefore, the sensor can be installed without installation tolerances, so that the abovementioned air gap can be reduced and therefore the reading range of the measurement pickup can be increased and the tolerance range of the sensor signal can be lowered.
- the flexible material is an elastomer which can be obtained at low cost and can be mass-processed.
- the elastomer has a Shore A hardness of at least 80 and is therefore suitable for providing, in addition to the abovementioned elasticity, a sufficient degree of resistance in relation to other mechanical loads.
- the elastomers used can particularly preferably be thermoplastic elastomers which can be plastically processed starting from a specific temperature to form the installation housing.
- the installation housing extends from the measurement pickup housing in a direction of the data line around the data line in the manner of a rod. If the sensor is fastened, for example, to the abovementioned axle body of the vehicle, the sensor can be fastened to an outer side of the axle body of the vehicle and, owing to its rod-like design of the installation housing, can be inserted into an interior space in the axle body via an opening.
- At least one bending groove is formed on the installation housing.
- the bending groove can be arranged in such a way that the installation housing has a preferred bending direction.
- the preferred bending direction should be defined such that the installation housing can absorb mechanical loads between two mounting points of the specified sensor which are situated on the fastening element and the measurement pickup housing. In this way, the preferred mechanical load absorption by the installation housing in relation to the measurement pickup housing can be further increased, as a result of which the mechanical loads on the measurement pickup housing and therefore the measurement pickup can be further reduced.
- two or more bending grooves are particularly preferably formed on the installation housing.
- At least two crushing ribs which are placed in an axially symmetrical manner around the data line and can be deformed by the sensor receptacle are formed on the installation housing.
- the elastic material on the sensor receptacle can be stiffened by pinching the sensor receptacle, as a result of which the sensor is held in a stable manner on the sensor receptacle by means of the pinched and stiffened installation housing.
- the crushing rib is formed between the bending groove and the fastening element, so that it is ensured that the abovementioned mechanical loads also act on the bending groove and are kept away from the measurement pickup housing and therefore from the measurement pickup.
- the data line can be flexible at least in the region of the connection point in the specified sensor.
- the measurement pickup housing which is expediently designed to be rigid in the abovementioned manner, can be produced from a synthetic resin, in particular from an epoxy resin.
- a vehicle comprises an axle body which is fastened to a chassis, a wheel which is fastened in a rotatable manner to the axle body by means of a wheel bearing, and one of the specified sensors, the fastening element and the measurement pickup housing of said sensor correspondingly being fastened to the axle body or to an element of the wheel bearing, said element being fixed in position in relation to the axle body.
- FIG. 1 shows a schematic view of a vehicle having driving dynamics control
- FIG. 2 shows a schematic sectional view through a wheel suspension arrangement in the vehicle of FIG. 1 ,
- FIG. 3 shows a schematic sectional view through a rotation speed sensor in an installed state on the wheel suspension arrangement of FIG. 2 ,
- FIG. 4 shows a schematic view of an alternative rotation speed sensor
- FIG. 5 shows a schematic view of a further alternative rotation speed sensor.
- FIG. 1 shows a schematic view of a vehicle 2 having driving dynamics control which is known per se. Details of this driving dynamics control can be found in DE 10 2011 080 789 A1, which is incorporated by reference, for example.
- the vehicle 2 comprises a chassis 4 and four wheels 6 which are each held in a rotatable manner on the chassis 4 by means of a wheel suspension arrangement 5 .
- Each wheel 6 can be decelerated with respect to the chassis 4 by means of a brake 8 which is fastened to the chassis 4 in a fixed position, in order to decelerate a movement of the vehicle 2 on a road, not illustrated any further.
- the wheels 6 of the vehicle 2 may lose their grip on the road and the vehicle 2 may even move away from a trajectory which is prespecified, for example, by means of a steering wheel, not shown any further, as a result of understeering or oversteering.
- control circuits such as ABS (anti-lock braking system) and ESP (electronic stability program) which are known per se.
- the vehicle 2 has rotation speed sensors 10 on the wheels 6 for this purpose, said rotation speed sensors detecting a rotation speed 12 of the wheels 6 .
- the vehicle 2 also has an inertia sensor 14 which detects driving dynamics data 16 relating to the vehicle 2 , from amongst which data a pitch rate, a roll rate, a yaw rate, a lateral acceleration, a longitudinal acceleration and/or a vertical acceleration, for example, can be output in a manner known per se to a person skilled in the art.
- a controller 18 can determine, in a manner known to a person skilled in the art, whether the vehicle 2 is sliding on the road or even deviates from the abovementioned prespecified trajectory and can accordingly react thereto with a controller output signal 20 which is known per se.
- the controller output signal 20 can then be used by an actuating device 22 to control actuating elements, such as the brakes 8 , which react to the sliding and the deviation from the prespecified trajectory in a manner which is known per se, by means of actuating signals 24 .
- the controller 18 may be integrated, for example, in an engine controller of the vehicle 2 which is known per se.
- the controller 18 and the actuating device 22 can also be in the form of a common control device and can be optionally integrated in the abovementioned engine controller.
- the present invention is intended to be explained in more detail using the wheel rotation speed sensor 10 shown in FIG. 1 , even though the present invention can be implemented in any desired electronic apparatuses and in particular in any desired sensors, such as magnetic field sensors, acceleration sensors, rate-of-rotation sensors, structure-borne sound sensors or temperature sensors.
- FIG. 2 shows a schematic sectional view through one of the wheel suspension arrangements 5 in the vehicle 2 of FIG. 1 .
- the axle body 26 has an inner bore 34 which runs concentrically around a rotation axis 32 and in which a wheel bearing 36 is held.
- the wheel bearing 36 is designed as a second-generation wheel bearing in the present embodiment. Wheel bearings of this kind are known in a technically relevant manner, for example, from DE 195 37 808 A1, which is incorporated by reference and for this reason the functioning of said wheel bearings does not need to be discussed further in the text which follows.
- the wheel bearing 36 comprises an outer ring 38 which is held in the inner bore 34 of the axle body 26 in a rotationally fixed manner and comprises an inner ring 40 which is held in a rotatable manner in relation to the inner ring by means of roller elements 42 .
- a wheel flange 44 extends axially on the inner ring 40 , it being possible for the wheel 6 to be held on said wheel flange in a manner fastened by means of screws 30 .
- the rotation speed sensor 10 can be routed axially very close to the inner ring 40 which is generally fitted with an encoder 52 , shown in FIG. 3 , which excites a magnetic transmitter field which can be evaluated for the rotation speed sensor 10 .
- the encoder 52 can optionally be added to the rotation speed sensor 10 .
- FIG. 3 shows a schematic sectional view of the rotation speed sensor 10 in an installed state on the wheel suspension arrangement 5 of FIG. 2 .
- the rotation speed sensor 10 has a measurement pickup 54 and a data line 56 which, in the present embodiment, is designed as pins 58 and as a data cable 60 which is connected to the pins 58 .
- the data cable 60 can be connected to the controller 18 , while the pins 58 are terminated at the measurement pickup 54 , so that a rotation speed signal 62 which carries the rotation speed 12 can be conducted from the measurement pickup 54 , via the pins 58 and the data cable 60 , to the controller 18 for the abovementioned processing of the rotation speed 12 .
- This installation housing 68 has a support plate 70 through which a fastening element 72 is routed, it being possible for the screw 30 to be routed through said fastening element.
- the support plate 70 can be supported on the outer side of the axle body 28 as seen from the space 50 , so that the rotation speed sensor 10 is held securely on the axle body 28 after the screw 30 has been screwed in.
- the rotation speed sensor 10 is primarily deformed at the bending grooves 76 of the rod-like projection 74 owing to the thermal movements.
- the measurement pickup 54 remains largely free of mechanical stress owing to the rigid measurement pickup housing 64 .
- a collar 77 is formed on the rod-like projection 74 in the region of attachment to the connection plate 70 , said collar being axially adjoined by a plurality of crushing ribs 78 which are placed around the periphery of the rod-like projection 74 .
- the rotation speed sensor 10 is initially radially centered by the collar 77 . If the rod-like projection 74 is inserted further into the receiving opening 28 , the crushing ribs 78 are deformed by pinching, so that the rotation speed sensor 10 is firmly supported on the axle body 26 within the receiving opening 28 too.
- the crushing ribs 78 can absorb mechanical stresses from the axle body 26 , as can occur, for example, due to thermal movements of the axle body 26 , so that the overall elastic effect of the rotation speed sensor 10 is further increased.
- the crushing ribs 78 are routed axially on the rod-like projection 74 and can be placed around the periphery of said rod-like projection
- the bending grooves 76 can be formed, for example, in a direction 80 which is directed toward the inner ring 38 and in the opposite direction in the rod-like projection 74 in order firstly to ensure a high degree of stability of the rod-like projection 74 but also to provide the rod-like projection 74 with a high degree of flexibility.
- FIG. 4 shows a schematic view of a rotation speed sensor 10 , which is an alternative to the rotation speed sensor 10 of FIG. 3 , in a state in which it is not installed in the vehicle 2 .
- the rotation speed sensor of FIG. 4 has six bending grooves 76 instead of four bending grooves 76 .
- the flexibility of the rod-like projection can be further increased in this way.
- FIG. 5 shows a schematic view of a further alternative rotation speed sensor 10 .
- the rotation speed sensor 10 of FIG. 5 corresponds substantially to the rotation speed sensor 10 of FIG. 4 , wherein electrical contact is made with the pins 58 by a plug receptacle 80 instead of by a cable, it being possible for a plug, which is not illustrated further, to be accommodated in said plug receptacle. Said plug can then, in turn, be connected to a corresponding data cable which leads to the controller 18 .
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- General Physics & Mathematics (AREA)
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- Body Structure For Vehicles (AREA)
Abstract
Description
- This application is the U.S. National Phase Application of PCT International Application No. PCT/EP2014/071587, filed Oct. 8, 2014, which claims priority to German Patent Application No. 10 2013 226 045.8, filed Dec. 16, 2013, the contents of such applications being incorporated by reference herein.
- The invention relates to a sensor for outputting a sensor signal which is dependent on a variable which is to be measured, and to a vehicle comprising the sensor.
- WO 2010/037 810 A1, which is incorporated by reference discloses a sensor for outputting a sensor signal which is dependent on a variable which is to be measured. The sensor comprises a measurement pickup which is electrically connected to a data line at a connection point and is designed to feed the sensor signal which is dependent on the variable which is to be measured into the data line, so that the sensor signal can be output via the data line. Furthermore, an installation housing which houses the measurement pickup and the data line at least at a connection point can be formed within the scope of a plastic injection-molding process, known as “transfer molding”
- An aspect of the invention aims to improve the known sensor.
- According to one aspect of the invention, a sensor for outputting a sensor signal which is dependent on a variable which is to be measured comprises a measurement pickup which is electrically connected to a data line at a connection point, is housed in a measurement pickup housing and is designed to feed the sensor signal which is dependent on the variable which is to be measured into the data line, so that the sensor signal can be output via the data line, an installation housing which houses the measurement pickup housing and the data line at least at a connection point and is produced from a flexible material, and a fastening element, which is fixedly connected to the installation housing, for fastening the installation housing to a sensor receptacle, wherein the measurement pickup housing and the fastening element are arranged on two opposite sides of the installation housing.
- In this case, the flexible material can be a material with a specific modulus of elasticity. The flexibility of the material can also be prespecified by means of a compression set. This is the remaining deformation of the material which remains after deformation with a specific loading over a specific period of time and at a prespecified temperature. The test method used can be, for example, ASTM D395.
- The specified sensor is based on the consideration that the sensor, as a wheel rotation speed sensor, could be fastened to an axle body of a vehicle by means of the fastening element and the installation housing in order to measure the wheel rotation speed of a wheel which is mounted in a rotatable manner on the axle body. In this case, the material used for the installation housing could be a rigid material, such as a polyamide for example, in order to prevent the measurement pickup housing and therefore the measurement pickup from being subjected to mechanical loading and therefore outputting a sensor signal, which is incorrectly dependent on the variable which is to be measured, on account of the mechanical load.
- Furthermore, the specified sensor is based on the consideration that the sensor has to be fastened to such a rigid installation housing with a predetermined installation tolerance in relation to a wheel bearing in the axle body that the measurement pickup housing does not overlap with the wheel bearing and therefore mechanical stresses are applied to the installation housing, these mechanical stresses then acting on the measurement pickup. Mechanical stresses of this kind can be produced, for example, by temperature fluctuations in the other components and subject the installation housing to changes in load which can reach a number of up to two million over the service life of the housing. However, an air gap between the measurement pickup and a transmitter element is increased owing to the installation tolerance, this however increasing the tolerance range of the sensor signal and restricting a reading range of the measurement pickup at the same time.
- Here, the specified sensor starts with the consideration that the measurement pickup housing itself is generally produced from a rigid material. This rigid material protects the measurement pickup against the abovementioned mechanical loads. Therefore, the installation housing can be produced from a flexible material which absorbs all mechanical loads which may occur owing to the installed state of the specified sensor, for example in a vehicle, and keeps said mechanical loads away from the measurement pickup housing and therefore from the measurement pickup. Therefore, the sensor can be installed without installation tolerances, so that the abovementioned air gap can be reduced and therefore the reading range of the measurement pickup can be increased and the tolerance range of the sensor signal can be lowered.
- In one development of the specified sensor, the flexible material is an elastomer which can be obtained at low cost and can be mass-processed.
- In a particular development of the specified sensor, the elastomer has a Shore A hardness of at least 80 and is therefore suitable for providing, in addition to the abovementioned elasticity, a sufficient degree of resistance in relation to other mechanical loads. In this case, the elastomers used can particularly preferably be thermoplastic elastomers which can be plastically processed starting from a specific temperature to form the installation housing.
- In another development of the specified sensor, the installation housing extends from the measurement pickup housing in a direction of the data line around the data line in the manner of a rod. If the sensor is fastened, for example, to the abovementioned axle body of the vehicle, the sensor can be fastened to an outer side of the axle body of the vehicle and, owing to its rod-like design of the installation housing, can be inserted into an interior space in the axle body via an opening.
- In an additional development of the specified sensor, at least one bending groove is formed on the installation housing. In this case, the bending groove can be arranged in such a way that the installation housing has a preferred bending direction. In this case, the preferred bending direction should be defined such that the installation housing can absorb mechanical loads between two mounting points of the specified sensor which are situated on the fastening element and the measurement pickup housing. In this way, the preferred mechanical load absorption by the installation housing in relation to the measurement pickup housing can be further increased, as a result of which the mechanical loads on the measurement pickup housing and therefore the measurement pickup can be further reduced. In this case, two or more bending grooves are particularly preferably formed on the installation housing.
- In a preferred development of the specified sensor, at least two crushing ribs which are placed in an axially symmetrical manner around the data line and can be deformed by the sensor receptacle are formed on the installation housing. In this way, the elastic material on the sensor receptacle can be stiffened by pinching the sensor receptacle, as a result of which the sensor is held in a stable manner on the sensor receptacle by means of the pinched and stiffened installation housing.
- In a particularly preferred development of the specified sensor, the crushing rib is formed between the bending groove and the fastening element, so that it is ensured that the abovementioned mechanical loads also act on the bending groove and are kept away from the measurement pickup housing and therefore from the measurement pickup.
- In order to further improve the process of diverting the abovementioned mechanical loads away from the measurement pickup housing and therefore from the measurement pickup, the data line can be flexible at least in the region of the connection point in the specified sensor.
- In a particularly preferred development of the specified sensor, the measurement pickup housing, which is expediently designed to be rigid in the abovementioned manner, can be produced from a synthetic resin, in particular from an epoxy resin.
- According to a further aspect of the invention, a vehicle comprises an axle body which is fastened to a chassis, a wheel which is fastened in a rotatable manner to the axle body by means of a wheel bearing, and one of the specified sensors, the fastening element and the measurement pickup housing of said sensor correspondingly being fastened to the axle body or to an element of the wheel bearing, said element being fixed in position in relation to the axle body.
- The above-described properties, features and advantages of this invention and the way in which they are achieved will become clearer and more clearly understood in connection with the following description of the exemplary embodiments which are explained in more detail in connection with the drawings, in which:
-
FIG. 1 shows a schematic view of a vehicle having driving dynamics control, -
FIG. 2 shows a schematic sectional view through a wheel suspension arrangement in the vehicle ofFIG. 1 , -
FIG. 3 shows a schematic sectional view through a rotation speed sensor in an installed state on the wheel suspension arrangement ofFIG. 2 , -
FIG. 4 shows a schematic view of an alternative rotation speed sensor, and -
FIG. 5 shows a schematic view of a further alternative rotation speed sensor. - In the figures, identical technical elements are provided with identical reference symbols and are described only once.
- Reference is made to
FIG. 1 which shows a schematic view of avehicle 2 having driving dynamics control which is known per se. Details of this driving dynamics control can be found in DE 10 2011 080 789 A1, which is incorporated by reference, for example. - The
vehicle 2 comprises a chassis 4 and fourwheels 6 which are each held in a rotatable manner on the chassis 4 by means of awheel suspension arrangement 5. Eachwheel 6 can be decelerated with respect to the chassis 4 by means of abrake 8 which is fastened to the chassis 4 in a fixed position, in order to decelerate a movement of thevehicle 2 on a road, not illustrated any further. - In this case, in a manner known to a person skilled in the art, the
wheels 6 of thevehicle 2 may lose their grip on the road and thevehicle 2 may even move away from a trajectory which is prespecified, for example, by means of a steering wheel, not shown any further, as a result of understeering or oversteering. This is avoided using control circuits such as ABS (anti-lock braking system) and ESP (electronic stability program) which are known per se. - In the present embodiment, the
vehicle 2 hasrotation speed sensors 10 on thewheels 6 for this purpose, said rotation speed sensors detecting arotation speed 12 of thewheels 6. Thevehicle 2 also has aninertia sensor 14 which detectsdriving dynamics data 16 relating to thevehicle 2, from amongst which data a pitch rate, a roll rate, a yaw rate, a lateral acceleration, a longitudinal acceleration and/or a vertical acceleration, for example, can be output in a manner known per se to a person skilled in the art. - On the basis of the detected
rotation speeds 12 anddriving dynamics data 16, acontroller 18 can determine, in a manner known to a person skilled in the art, whether thevehicle 2 is sliding on the road or even deviates from the abovementioned prespecified trajectory and can accordingly react thereto with acontroller output signal 20 which is known per se. Thecontroller output signal 20 can then be used by an actuatingdevice 22 to control actuating elements, such as thebrakes 8, which react to the sliding and the deviation from the prespecified trajectory in a manner which is known per se, by means of actuatingsignals 24. - The
controller 18 may be integrated, for example, in an engine controller of thevehicle 2 which is known per se. Thecontroller 18 and theactuating device 22 can also be in the form of a common control device and can be optionally integrated in the abovementioned engine controller. - The present invention is intended to be explained in more detail using the wheel
rotation speed sensor 10 shown inFIG. 1 , even though the present invention can be implemented in any desired electronic apparatuses and in particular in any desired sensors, such as magnetic field sensors, acceleration sensors, rate-of-rotation sensors, structure-borne sound sensors or temperature sensors. - Reference is made to
FIG. 2 which shows a schematic sectional view through one of thewheel suspension arrangements 5 in thevehicle 2 ofFIG. 1 . - The
wheel suspension arrangement 5 has anaxle body 26 which is fastened to the chassis 4 such that it is rotationally fixed in relation to thewheel 6 and possibly can be deflected by means of a steering arrangement. A receivingopening 28 is formed through theaxle body 26, therotation speed sensor 10 which is correspondingly arranged on thewheel suspension arrangement 5 being routed through said receiving opening. Saidrotation speed sensor 10 will be discussed in detail at a later point. Therotation speed sensor 10 is fastened to theaxle body 26 by means of ascrew 30. - The
axle body 26 has aninner bore 34 which runs concentrically around arotation axis 32 and in which awheel bearing 36 is held. Thewheel bearing 36 is designed as a second-generation wheel bearing in the present embodiment. Wheel bearings of this kind are known in a technically relevant manner, for example, from DE 195 37 808 A1, which is incorporated by reference and for this reason the functioning of said wheel bearings does not need to be discussed further in the text which follows. - The
wheel bearing 36 comprises anouter ring 38 which is held in theinner bore 34 of theaxle body 26 in a rotationally fixed manner and comprises aninner ring 40 which is held in a rotatable manner in relation to the inner ring by means ofroller elements 42. Awheel flange 44 extends axially on theinner ring 40, it being possible for thewheel 6 to be held on said wheel flange in a manner fastened by means ofscrews 30. - On that side of the wheel bearing 36 which is situated axially opposite the
wheel flange 44, theinner bore 34 of theaxle body 26 is covered by acap 48, so that aspace 50 into which thesensor 10 is inserted is formed. In the process, therotation speed sensor 10 can be routed axially very close to theinner ring 40 which is generally fitted with anencoder 52, shown inFIG. 3 , which excites a magnetic transmitter field which can be evaluated for therotation speed sensor 10. In this case, theencoder 52 can optionally be added to therotation speed sensor 10. - Reference is made to
FIG. 3 which shows a schematic sectional view of therotation speed sensor 10 in an installed state on thewheel suspension arrangement 5 ofFIG. 2 . - The
rotation speed sensor 10 has ameasurement pickup 54 and adata line 56 which, in the present embodiment, is designed aspins 58 and as adata cable 60 which is connected to thepins 58. Thedata cable 60 can be connected to thecontroller 18, while thepins 58 are terminated at themeasurement pickup 54, so that arotation speed signal 62 which carries therotation speed 12 can be conducted from themeasurement pickup 54, via thepins 58 and thedata cable 60, to thecontroller 18 for the abovementioned processing of therotation speed 12. - In the present embodiment, the
measurement pickup 54 is accommodated in a rigidmeasurement pickup housing 64 which can be produced, for example, from an epoxy resin. Thepins 58 are routed out of thismeasurement pickup housing 64. Thepins 58, thedata cable 60 and themeasurement pickup housing 64 are enclosed by aninstallation housing 68 at anelectrical connection point 66 at which thedata cable 60 is electrically connected to thepins 58. The installation housing can be produced, for example, from a thermoplastic material by injection molding around thedata cable 60 and themeasurement pickup housing 64. - The thermoplastic material should have a Shore A hardness of at least 80.
- This
installation housing 68 has asupport plate 70 through which afastening element 72 is routed, it being possible for thescrew 30 to be routed through said fastening element. At the same time, thesupport plate 70 can be supported on the outer side of theaxle body 28 as seen from thespace 50, so that therotation speed sensor 10 is held securely on theaxle body 28 after thescrew 30 has been screwed in. - A rod-
like projection 74 through which thedata line 56 is routed extends from theconnection plate 70, through the receivingopening 28, in the direction of thedata line 56. This rod-like projection 74 also partially encloses themeasurement pickup housing 64. In this case, the rod-like projection 74 can also extend from theconnection plate 70 on a side which is situated opposite the receivingopening 28. - Bending
grooves 76 are formed in the rod-like projection 74 on the side of the receivingopening 28, said bending grooves weakening the rod-like projection 74 at this point, so that it can be bent more easily at these points. In the installed state shown inFIGS. 2 and 3 , therotation speed sensor 10 has two mechanical fastening points in thevehicle 2. Firstly, therotation speed sensor 10 is fastened to theaxle body 26 by way of itsconnection plate 70. Furthermore, therotation speed sensor 10 is firmly supported on theouter ring 38 of the wheel bearing 36 by way of themeasurement pickup housing 64. If theouter ring 38 of the wheel bearing 36 moves, for example owing to thermal movements, therotation speed sensor 10 is primarily deformed at the bendinggrooves 76 of the rod-like projection 74 owing to the thermal movements. Themeasurement pickup 54 remains largely free of mechanical stress owing to the rigidmeasurement pickup housing 64. - In order to firmly hold the
rotation speed sensor 10 in the receivingopening 28 on the rod-like projection 74, acollar 77 is formed on the rod-like projection 74 in the region of attachment to theconnection plate 70, said collar being axially adjoined by a plurality of crushingribs 78 which are placed around the periphery of the rod-like projection 74. When the rod-like projection 74 is inserted into the receivingopening 28, therotation speed sensor 10 is initially radially centered by thecollar 77. If the rod-like projection 74 is inserted further into the receivingopening 28, the crushingribs 78 are deformed by pinching, so that therotation speed sensor 10 is firmly supported on theaxle body 26 within the receivingopening 28 too. Furthermore, the crushingribs 78 can absorb mechanical stresses from theaxle body 26, as can occur, for example, due to thermal movements of theaxle body 26, so that the overall elastic effect of therotation speed sensor 10 is further increased. - Whereas the crushing
ribs 78 are routed axially on the rod-like projection 74 and can be placed around the periphery of said rod-like projection, the bendinggrooves 76 can be formed, for example, in adirection 80 which is directed toward theinner ring 38 and in the opposite direction in the rod-like projection 74 in order firstly to ensure a high degree of stability of the rod-like projection 74 but also to provide the rod-like projection 74 with a high degree of flexibility. - By virtue of the abovementioned embodiment of the
rotation speed sensor 10, said rotation speed sensor can be fastened at different points in thevehicle 2 without thermal movements of the elements in thevehicle 2 and a resulting change in load on therotation speed sensor 10 leading to mechanical loads on themeasurement pickup 54 and corrupting the measuredrotation speed 12 in therotation speed signal 62. - Reference is made to
FIG. 4 which shows a schematic view of arotation speed sensor 10, which is an alternative to therotation speed sensor 10 ofFIG. 3 , in a state in which it is not installed in thevehicle 2. - The rotation speed sensor of
FIG. 4 has six bendinggrooves 76 instead of four bendinggrooves 76. The flexibility of the rod-like projection can be further increased in this way. - Reference is made to
FIG. 5 which shows a schematic view of a further alternativerotation speed sensor 10. - The
rotation speed sensor 10 ofFIG. 5 corresponds substantially to therotation speed sensor 10 ofFIG. 4 , wherein electrical contact is made with thepins 58 by aplug receptacle 80 instead of by a cable, it being possible for a plug, which is not illustrated further, to be accommodated in said plug receptacle. Said plug can then, in turn, be connected to a corresponding data cable which leads to thecontroller 18.
Claims (12)
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102013226045.8 | 2013-12-16 | ||
DE102013226045.8A DE102013226045A1 (en) | 2013-12-16 | 2013-12-16 | Mechanically over-determined built-in speed sensor with elastic encapsulation |
DE102013226045 | 2013-12-16 | ||
PCT/EP2014/071587 WO2015090664A1 (en) | 2013-12-16 | 2014-10-08 | Rotational speed sensor which is installed in a mechanically overdetermined manner with an elastic injection-moulded encapsulation |
Publications (2)
Publication Number | Publication Date |
---|---|
US20160282154A1 true US20160282154A1 (en) | 2016-09-29 |
US10060770B2 US10060770B2 (en) | 2018-08-28 |
Family
ID=51690375
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US15/034,631 Expired - Fee Related US10060770B2 (en) | 2013-12-16 | 2014-10-08 | Rotational speed sensor which is installed in a mechanically overdetermined manner with an elastic injection-moulded encapsulation |
Country Status (6)
Country | Link |
---|---|
US (1) | US10060770B2 (en) |
EP (1) | EP3084354B1 (en) |
KR (1) | KR20160100305A (en) |
CN (1) | CN106030252B (en) |
DE (1) | DE102013226045A1 (en) |
WO (1) | WO2015090664A1 (en) |
Cited By (1)
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CN113884119A (en) * | 2021-11-01 | 2022-01-04 | 五度智能科技(徐州)有限公司 | Protective equipment can be observed to intelligent instrument and meter self-adaptation |
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JP7028067B2 (en) * | 2018-05-31 | 2022-03-02 | 日立金属株式会社 | Magnetic detection sensor, rotation detection sensor and cable with sensor |
KR20230003975A (en) * | 2021-06-30 | 2023-01-06 | 에이치엘만도 주식회사 | Device for sensing wheel speed |
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Also Published As
Publication number | Publication date |
---|---|
WO2015090664A1 (en) | 2015-06-25 |
US10060770B2 (en) | 2018-08-28 |
KR20160100305A (en) | 2016-08-23 |
CN106030252A (en) | 2016-10-12 |
EP3084354A1 (en) | 2016-10-26 |
DE102013226045A1 (en) | 2015-06-18 |
CN106030252B (en) | 2019-02-19 |
EP3084354B1 (en) | 2018-07-25 |
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